US4077260A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optically active cyano-biphenyl compounds and liquid crystal materials containing them
Assignee: UK Secretary of State for Defence
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Filing: 1976-08-20
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Granted: 1978-03-07
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Expires: 1996-08-20
Abstract
Abstract Liquid crystal compounds are disclosed having the formula ##STR1## where p is an integer having a value from 0 to 5 inclusive. These materials are optically active and cholesterogenic and may be used in an electro-optical display device either on their own or in admixture with nematogenic materials having a formula ##STR2## where i has a value from 0 to 5 inclusive and j is 0 or 1. These last mentioned mixtures may be thermochromic and employed in a temperature sensing device.
Inventors
- 👤 George William Gray
- 👤 Damien Gerard McDonnell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 21:57
CPC Classifications
C; C07; C07C; C07C17/00; C07C17/093; C07C17/18; B; B41; B41M; B41M5/00; B41M5/26; B41M5/28; B41M5/281; C07C17/10; C07C17/12; C07C17/16; C07C17/35; C07C49/00; C07C49/76; C07C49/80; C07C49/813; C07C51/00; C07C51/15; C07F; C07F3/00; C07F3/02; C09; C09K; C09K19/00; C09K19/04; C09K19/06; C09K19/08; C09K19/10; C09K19/12; C09K19/126; G; G01; G01K; G01K11/00; G01K11/12; G01K11/16; G01K11/165; G02; G02F; G02F1/00; G02F1/01; G02F1/13; G02F1/137; G02F1/13731; G02F1/13737
Claims Analysis
Total Claims: 31
Claim 1
Independent Claim
85 words
A liquid crystal material consisting essentially of an admixture of (1) one or more optically active biphenyl compounds having a positive optical rotation angle and having the formula: ##STR18## where p is an integer having a value of from 0 to 5 inclusive and (2) at least one optically active cholesterogenic compound different from (1) having a positive optical rotation angle and having the formula: ##STR19## where i is an integer having a value from 0 to 5 inclusive and j is 0 or 1.
Claim 2
Dependent Claim
85 words
A liquid crystal material consisting essentially of an admixture of (1) one or more optically active biphenyl compounds having a positive optical rotation angle and having the formula: ##STR18## where p is an integer having a value of from 0 to 5 inclusive and (2) at least one optically active cholesterogenic compound different from (1) having a positive optical rotation angle and having the formula: ##STR19## where i is an integer having a value from 0 to 5 inclusive and j is 0 or 1.
Claim 3
Dependent Claim
20 words
A liquid crystal material as claimed in claim 1 wherein said cholesterogenic compound is a terphenyl wherein j is 1.
Claim 4
Dependent Claim
16 words
A liquid crystal material as claimed in claim 2 and wherein the cholesterogenic compound is (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl.
Claim 5
Dependent Claim
16 words
A liquid crystal material as claimed in claim 2 and wherein the cholesterogenic compound is (+)-4-(4'"-methylhexyl)-4"-cyano-p-terphenyl.
Claim 6
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(2"-methylbutyl)-4'-cyanobiphenyl and (+)-4-(3'"-methypentyl)-4"-cyano-p-terphenyl.
Claim 7
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(2"-methylbutyl)-4'-cyanobiphenyl and (+)-4-(3'"-methypentyl)-4"-cyano-p-terphenyl.
Claim 8
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(2"-methylbutyl)-4'-cyanobiphenyl and (+)-4-(4'"-methylhexyl)-4"-cyano-p-terphenyl.
Claim 9
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(2"-methylbutyl)-4'-cyanobiphenyl and (+)-4-(4'"-methylhexyl)-4"-cyano-p-terphenyl.
Claim 10
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl and (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl.
Claim 11
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl and (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl.
Claim 12
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl and (+)-4-(4'"-methylhexyl)-4"-cyano-p-terphenyl.
Claim 13
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl and (+)-4-(4'"-methylhexyl)-4"-cyano-p-terphenyl.
Claim 14
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4(3'"methylpentyl)-4"-cyano-p-terphenyl.
Claim 15
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4(3'"methylpentyl)-4"-cyano-p-terphenyl.
Claim 16
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4(4'"-methylhexyl)-4"-cyano-p-terphenyl.
Claim 17
Dependent Claim
13 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4(4'"-methylhexyl)-4"-cyano-p-terphenyl.
Claim 18
Dependent Claim
14 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(2"-methylbutyl)-4"-cyanobiphenyl, (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl.
Claim 19
Dependent Claim
14 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(2"-methylbutyl)-4"-cyanobiphenyl, (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl.
Claim 20
Dependent Claim
16 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(2"-methylbutyl)-4'-cyanobiphenyl, (+)-4-(4"-methyl hexyl)-4'-cyanobiphenyl and (+)-4-(4'"-methyl hexyl)-4"-cyano-p-terphenyl.
Claim 21
Dependent Claim
16 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(2"-methylbutyl)-4'-cyanobiphenyl, (+)-4-(4"-methyl hexyl)-4'-cyanobiphenyl and (+)-4-(4'"-methyl hexyl)-4"-cyano-p-terphenyl.
Claim 22
Dependent Claim
14 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl, (+)-4(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl.
Claim 23
Dependent Claim
14 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl, (+)-4(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl.
Claim 24
Dependent Claim
14 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl, (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl and (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl.
Claim 25
Dependent Claim
14 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl, (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl and (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl.
Claim 26
Dependent Claim
15 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl, (+)-4-(2"-methylbutyl)-4'-cyanobiphenyl, (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4-(4'"-methylhexyl)-4"-cyano-p-terphenyl.
Claim 27
Dependent Claim
15 words
A liquid crystal material consisting essentially of a mixture of (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl, (+)-4-(2"-methylbutyl)-4'-cyanobiphenyl, (+)-4-(4"-methylhexyl)-4'-cyanobiphenyl and (+)-4-(4'"-methylhexyl)-4"-cyano-p-terphenyl.
Claim 28
Dependent Claim
109 words
A temperature sensing device containing a cholesteric liquid crystal material consisting essentially of in admixture (1) one or more optically active biphenyl compounds having a positive optical rotation angle and having the formula: ##STR20## wherein p is an integer having a value from 0 to 5 inclusive and (2) at least one optically active cholesterogenic compound different from (1) having a positive optical rotation angle and having the formula: ##STR21## wherein i is an integer having a value from 0 to 5 inclusive and j is 0 or 1, said liquid crystal material being sandwiched, in its Grandjean plane texture, between the inner surface area of two transparent slides.
Claim 29
Dependent Claim
109 words
A temperature sensing device containing a cholesteric liquid crystal material consisting essentially of in admixture (1) one or more optically active biphenyl compounds having a positive optical rotation angle and having the formula: ##STR20## wherein p is an integer having a value from 0 to 5 inclusive and (2) at least one optically active cholesterogenic compound different from (1) having a positive optical rotation angle and having the formula: ##STR21## wherein i is an integer having a value from 0 to 5 inclusive and j is 0 or 1, said liquid crystal material being sandwiched, in its Grandjean plane texture, between the inner surface area of two transparent slides.
Claim 30
Dependent Claim
30 words
A temperature sensing device as claimed in claim 16 and wherein the liquid crystal material consists of the following mixture (+)-4-(3'"-methylpentyl)-4"-cyano-p-terphenyl -- 14% by weight (+)-4-(3"-methylpentyl)-4'-cyanobiphenyl -- 86% by weight.
Claim 31
Dependent Claim
35 words
A temperature sensing device as claimed in claim 16 and wherein the liquid crystal material consists of the following mixture (+)-4-(2"-methylbutyl)-4'-cyanobiphenyl -- 14% by weight (+)-4-(4"-methylexyl)-4'-cyanobiphenyl -- 74% by weight (+)-4-(4'"-methylhexyl)-4"-cyano-p-terphenyl -- 12% by weight.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1981-03-06 | 1981-09-05 | 1982-03-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1985-03-06 | 1985-09-05 | 1986-03-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1989-03-06 | 1989-09-05 | 1990-03-07 | $7700.00 | Window Closed / Lapsed |